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Analyze Properties of Chemical Compounds
Mathematica 6 lets you immediately take large-scale chemical data and do new analysis and visualization. This is a plot of melting point against molecular weight for alkanes.
In[1]:=

Click for copyable input
Graphics[Inset[

    ChemicalData[#], {ChemicalData[#, "MolecularWeight"], 

     ChemicalData[#, "MeltingPoint"]}, Center, Scaled[{.05, .05}]] & /@ 

  Select[ChemicalData["Alkane"], 

   NumericQ[ChemicalData[#, "MeltingPoint"]] &], 

 PlotRange -> {{0, 220}, Automatic}, Frame -> True, AspectRatio -> 1]
Out[1]=